19854913 has 8 divisors (see below), whose sum is σ = 21786408. Its totient is φ = 17981184.

The previous prime is 19854893. The next prime is 19854917. The reversal of 19854913 is 31945891.

It can be written as a sum of positive squares in 4 ways, for example, as 6517809 + 13337104 = 2553^2 + 3652^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19854913 - 2⁵ = 19854881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19854917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13720 + ... + 15097.

It is an arithmetic number, because the mean of its divisors is an integer number (2723301).

Almost surely, 2^19854913 is an apocalyptic number.

19854913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19854913 is a deficient number, since it is larger than the sum of its proper divisors (1931495).

19854913 is a wasteful number, since it uses less digits than its factorization.

19854913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28883.

The product of its digits is 38880, while the sum is 40.

The square root of 19854913 is about 4455.8852094730. The cubic root of 19854913 is about 270.7837901856.

The spelling of 19854913 in words is "nineteen million, eight hundred fifty-four thousand, nine hundred thirteen".